I used to get nearly run over just about everytime I walked back from the supermarket in York by RLJers on a particular junction in cars. If you stood the other side of the junction you'd sometimes see upto 6 cars doing it which was why when the ped crossing had gone green for quite a few seconds you'd have cars zooming through in a convoy for several seconds. Some poor blighter on a bike got smacked one day.. The local councillor agreed about that junction but like a 20 zone said that North Yorkshire police couldn't give a monkeys about traffic offences unless it was the once a year Coppergate crackdown or cycling in the fictional pedestrianized zone. I rarely saw cyclists RLJ other than ring road related routes (and not very often then). You'd hear a lot of people moaning in York but I think a lot of it was false advocates or Mike Usherwood's fanclub or people saying I saw someone RLJ in 1973 and they're all like that, evil lot.
In Sheffield there's a small commuting belt in the south west where it's flatter and I sometimes see other cyclists pulling up behind me at lights. Mobile phone used in cars, RLJing by cars, broken lights and speeding (not as bad as North Yorkshire) are the biggest problem on the roads. Cycling RLJing must be somewhere in the top 25 problems on the road but not that high up.